The Future of Investing
How index funds, near-zero fees, robo-advisors, private-market access and AI agents are moving investment decisions from human judgment to machine code, and what that means for markets and for you.
In a single generation, investing has moved from a craft practised by humans to a utility run by machines: cheaper, faster, and open to almost anyone. Investing is being rebuilt from the decision up, and understanding the shift (cheaper, faster, more automated, more accessible) is the difference between riding it and being priced by it.
What this argues
- Passive won the argumentThe index quietly became the default owner of the market.
- Fees fell to near zeroOwning the market is now essentially free, so the money moved elsewhere.
- Advice got automatedRobo-advisors turned allocation into a utility, and incumbents absorbed them.
- Access is the new frontierPrivate markets and direct indexing are being opened to the many.
- Machines now decideFrom execution to allocation to agentic AI, with new, systemic risks.
What has changed
Updated November 2026
Global ETF assets passed $24 trillion
- ETFGI reported global ETF assets above US$24 trillion for the first time at end-August 2026 ($24.03 trillion), and about $23.9 trillion at end-September, up 20.7% year to date.
- Year-to-date net inflows reached a record $2.24 trillion through September, with $276 billion in September alone (ETFGI, Oct 2026).
- iShares, Vanguard and State Street SPDR together managed $13.93 trillion, 58.3% of the total, so scale concentration continues (ETFGI, Oct 2026).
Fees fell again, passive fastest
Morningstar's 2026 US Fund Fee Study (May 2026) put the asset-weighted average fund fee at 0.32% for 2025, extending a two-decade decline. Passive funds averaged 0.10% after a 5.4% drop; active fund fees fell 2.7%.
Active funds improved, but most still trail
Morningstar's Active/Passive Barometer for the year to June 2026 (published 12 August 2026, covering about $29 trillion, 67% of the US fund market) found just over 40% of active strategies survived and beat passive peers over one year, up 7 points. Over ten years only about 25% did.
Passive share of US fund assets reached about 55%
Morningstar data cited by PWL Capital (April 2026) show passive funds held over 55% of US fund assets at year-end 2025, up from about 53%, with roughly $951 billion of passive inflows against $187 billion of active outflows. Morningstar dates the passive-over-active crossover to end-2023, earlier than the 2024 framing in Chapter 02.
Retail private-credit funds met gates
- Blue Owl closed quarterly redemptions in its non-traded BDC OBDC II from February 2026 and returned about 30% of its NAV through a March capital distribution (Wealth Management, 2026).
- Blackstone's BCRED lifted its Q1 2026 redemption limit from 5% to 7.9% to meet requests; Cliffwater's $33 billion interval fund received requests for 14% of shares against a 7% cap (Wealth Management, 2026).
- Reports put total Q1 2026 private-credit redemption requests above $20 billion; this figure comes from secondary sources and is not independently verified.
This is the illiquidity-versus-liquid-promise tension described in Chapter 05 showing up in practice.
The 401(k) alternative-assets rule moved to a proposal
Following the August 2025 executive order, the Department of Labor published a proposed rule on 30 March 2026 (Fiduciary Duties in Selecting Designated Investment Alternatives) creating a safe harbor weighing performance, fees, liquidity, valuation, benchmarks and complexity. Comments closed 1 June 2026; finalisation was reported as targeted for late 2026 (law-firm summaries, 2026). A final rule was not confirmed.
A major broker moved toward AI-agent trading for retail
Robinhood announced plans to let customers direct AI agents to trade equities, derivatives, crypto and event contracts (FOW, 28 May 2026). Rollout details were not available to verify, so this Level-4/5 step for retail remains an announcement.
Not refreshed: robo-advised assets and the Vanguard, Schwab, Betterment and Wealthfront figures, direct-indexing projection, private-market asset totals, algorithmic share of volume, retail trading share, SPIVA 15-year figure, Big Three ownership share, Alpha Arena results and the quant-fund figures.
From Judgment to Code
The handoff from humans to machines
For four centuries the edge in markets belonged to human judgment. In four decades, it moved into software. Systems now sense, decide and execute faster than any person and, increasingly, they learn.
Four centuries, from Amsterdam to autonomous agents
- First shares: Dutch East India Company shares trade in Amsterdam.
- Portfolio theory: Markowitz turns risk and return into mathematics.
- The index fund: Bogle launches Vanguard's first index fund.
- The ETF: SPY makes the S&P 500 trade like a stock.
- Robo-advisors: Betterment and Wealthfront automate advice.
- Agentic AI: LLM agents plan, trade and self-correct.
Five levels, from manual to fully agentic
- L1 Manual: humans pick and place trades. (Human decides)
- L2 Algorithmic: pre-set rules execute.
- L3 Automated: optimised end-to-end.
- L4 Autonomous: models adapt to new data.
- L5 Agentic: systems set their own goals. (Machine decides)
The math that made automation inevitable
| Breakthrough | What it did |
|---|---|
| Portfolio Selection (1952) | Markowitz shows how to optimise return for a given risk: diversification becomes a formula. |
| CAPM and the Sharpe ratio (1964) | Sharpe prices risk itself, giving every portfolio a benchmark and a score. |
| Black-Scholes (1973) | Options get a formula, the first corner of finance to run fully on machines. |
Individuals are back, but they trade through algorithms
View the data
| Retail share | |
|---|---|
| 2010 | 11 |
| 2015 | 13 |
| 2019 | 15 |
| 2020 | 20 |
| 2021 | 24 |
| 2023 | 18 |
| 2024 | 20 |
Source: Bloomberg Intelligence; JPMorgan (2024) · values read from the chart, approximate
The Passive Revolution
How the index ate active management
The most successful investment strategy of the last fifty years was to stop trying to win. By simply owning the whole market at rock-bottom cost, index funds beat most professionals and took their assets.
Passive assets overtook active by 2024 (Morningstar dates its own crossover to end-2023)
View the data
| Passive | Active | |
|---|---|---|
| 2010 | 1.4 | 5.6 |
| 2013 | 2.7 | 7.2 |
| 2016 | 4.4 | 8.7 |
| 2019 | 6.7 | 9.8 |
| 2021 | 8.5 | 11.5 |
| 2023 | 12.8 | 13.2 |
| 2024 | 15.8 | 14.4 |
Source: Morningstar (2024) · values read from the chart, approximate
A 1993 experiment is now a $24-trillion industry
View the data
| Global ETF assets | |
|---|---|
| 2010 | 1.3 |
| 2014 | 2.6 |
| 2018 | 4.8 |
| 2021 | 10 |
| 2024 | 14.7 |
| Sep 2026 | 23.9 |
| 2030E | 30 |
Source: ETFGI (2024, Oct 2026); BlackRock projections · values read from the chart, approximate
Why scale makes the leader almost unassailable
- Lower fees
- More inflows
- Greater scale
- Lower unit costs
- Cheaper still (and the loop repeats around index economics)
Two philosophies, one clear scoreboard
| The active promise | The passive reality | |
|---|---|---|
| Goal | Beat the market | Be the market |
| Cost | 0.5-1.0% a year | 0.03-0.10% a year |
| Bet | Skill picks winners | Costs compound, not calls |
| Record | Most trail the index | Beats most active, net |
The Race to Zero
How the price of investing collapsed
The cost of owning the market fell from about one percent to almost nothing: a price war investors won by doing nothing. When a product is commoditised, price falls to marginal cost. For indexing, that is close to zero.
Average fund fees fell by more than half
View the data
| Avg fund fee | |
|---|---|
| 2000 | 0.93 |
| 2005 | 0.79 |
| 2010 | 0.68 |
| 2015 | 0.55 |
| 2020 | 0.41 |
| 2023 | 0.36 |
| 2025 | 0.32 |
Source: Morningstar US Fund Fee Study (2024, 2026) · values read from the chart, approximate
How cheap investing actually got
Four moves that took fees to nothing
- Index the market: Vanguard's mutual structure removes the stock-picker's salary.
- Wrap it in an ETF: trading efficiency and tax advantages cut costs further.
- Zero-fee funds: Fidelity launches index funds charging nothing.
- Zero commissions: Schwab, then all major brokers, drop trading fees.
Where 'free' investing actually earns its keep
- Payment for order flow: brokers sell your orders to market makers for a fee.
- Securities lending: your shares are lent to short-sellers; the fund keeps much of the fee.
- Cash sweep: idle cash earns the broker interest, not you.
- Cross-sell: free trading is the funnel for margin loans, advice and premium tiers.
The Robo Frontier
Automated advice and hyper-personal portfolios
Robo-advisors proved a machine could do an adviser's core job (allocate, rebalance, and harvest losses) for a tenth of the price. Then the incumbents copied them, and the startups' edge became a feature everyone offers.
Robo-advised assets marched toward $2 trillion
View the data
| Robo-advised assets | |
|---|---|
| 2019 | 1 |
| 2021 | 1.4 |
| 2023 | 1.8 |
| 2025E | 2.1 |
| 2028E | 2.3 |
Source: Statista; compilation (2025)
What a robo-advisor actually does
- Profile: a questionnaire infers goals, horizon and risk tolerance.
- Allocate: map the profile to a low-cost ETF portfolio.
- Rebalance: drift back to target automatically as prices move.
- Tax-loss harvest: sell losers to bank tax savings, then reinvest.
Who actually won the robo war
| The disruptors | The incumbents | |
|---|---|---|
| Players | Betterment: ~$50B, still independent. Wealthfront: ~$75B, brand-led. | Vanguard: ~$300B+ advised, digital + human. Schwab: ~$80B intelligent portfolios. |
| Edge | Design, UX, being first | Existing clients, trust, scale |
| Problem / Result | Problem: costly to acquire clients | Result: absorbed the innovation |
Where each model sits on automation and personalisation
A two-axis map of automation (horizontal) against personalisation (vertical). Bespoke, hand-made (top left): private banking and human advisor. Bespoke, automated (top right): direct indexing. Middle right: robo-advisor. Lower right: target-date fund and, in the generic, automated corner, the index ETF. Generic, manual (bottom left) is empty.
Access: Private Markets
Opening the returns once reserved for the few
The best returns migrated to private markets, and the industry is now racing to sell them to everyone else. Fewer companies go public; value is created before the IPO. Access, not allocation, is the new battleground.
Private-market assets roughly tripled in a decade
View the data
| Private-market assets | |
|---|---|
| 2010 | 2.5 |
| 2015 | 5 |
| 2020 | 9.5 |
| 2023 | 14 |
| 2028E | 20 |
Source: Preqin; McKinsey Global Private Markets Review (2024)
Who can buy private markets, and how that is changing
| Investor tier | Access route |
|---|---|
| Sovereign and pensions | Direct deals, lowest fees, first look |
| Endowments and institutions | Full private allocations, 20-40% of assets |
| Ultra-high-net-worth | Feeder funds via private banks |
| Accredited investors | Interval funds and BDCs |
| Mass-market / 401(k) | Semi-liquid funds, tokenised access |
Six wrappers opening private markets to the many
- Interval funds: own private assets; redeem a fixed slice each quarter.
- BDCs: listed vehicles that hold portfolios of private credit.
- Semi-liquid funds: Blackstone's BREIT and peers, built for the wealthy.
- 401(k) inclusion: private equity enters US retirement menus.
- Tokenisation: blockchain fractions of funds and assets.
- Evergreen funds: perpetual vehicles with no fixed end date.
Opening private markets cuts both ways
| The promise | The peril | |
|---|---|---|
| Access / Illiquidity | Returns once reserved for the elite | You can't always get out |
| Diversification / Fees | Assets that don't move with stocks | 2-and-20 versus 0.03% indexing |
| Growth / Valuation | Capture value before the IPO | Marks are opaque and lagged |
| Fairness / Selection | The small investor gets a seat | Retail gets what institutions pass on |
The Autonomous Engine
From automating trades to generating alpha
The next ambition is not to match the market cheaply, but to beat it with machines that learn. Quant funds proved code can win; now LLMs and agents are reaching for the same prize, in public.
The firms that let code, not committees, invest
| Firm | What sets it apart |
|---|---|
| Renaissance / Medallion | The greatest track record in finance, reportedly ~39% net a year. |
| Two Sigma | $60B+ built on scanning text, filings and data at scale. |
| Citadel | Ranked #1 all-time by net gains: deep quant plus execution. |
| D.E. Shaw | Statistical arbitrage since 1988; the Oculus fund rarely loses. |
| XTX Markets | Machine-learning market-making across 50,000+ instruments. |
| Jump Trading | Deep and reinforcement learning for microsecond decisions. |
Six layers of a fully machine-run portfolio
- Risk and compliance: monitor, stress-test and enforce constraints.
- Execution: algorithms slice and route orders (e.g. JPMorgan's LOXM).
- Portfolio construction: optimise positions within risk limits.
- Signals: models translate information into predicted edge.
- Research: finance-native LLMs read filings, news and transcripts.
- Data: real-time and historical, market and non-market signals.
Centralised platforms vs distributed agents
| Centralised | Distributed | |
|---|---|---|
| Model | BlackRock's Aladdin monitors risk on ~$20T+ of assets | Open-source agents, agentic wallets, on-chain identity |
| Shape | One hub connected to many nodes | A mesh of independent, interconnected agents |
What a Level-5 mandate looks like end to end
- Set objectives: the human gives goals and constraints, not trades.
- Sense and research: agents ingest markets and news continuously.
- Decide and size: models choose positions and a risk budget.
- Execute and adapt: trade, monitor outcomes, adapt without reprogramming.
The New Fragilities
The hidden costs of a machine market
When everyone owns the same index and runs the same model, everyone tries to sell at the same moment. Automation removes human error and adds systemic correlation. Cheaper markets can be more fragile ones.
Six fragilities a serious investor tracks
- Herding: common models crowd the same trades, then unwind together.
- Model homogeneity: if everyone buys the same data, signals converge and diversification fails.
- Flash events: automated selling can drain liquidity in minutes.
- Concentration: three firms vote most of the S&P 500's shares.
- Accountability: you can't jail an algorithm; who owns the harm?
- Regulatory mismatch: over- and under-regulation across jurisdictions.
Four times automation broke the market
| What happened | The lesson | |
|---|---|---|
| Quant Quake, 2007 | Crowded quant trades unwound at once | Shared models, shared risk |
| Flash Crash, 2010 | ~$1T lost in minutes | Automation drains liquidity fast |
| Knight Capital, 2012 | $440M lost in 45 minutes | No kill-switch, no company |
| Volmageddon, 2018 | Volatility products imploded | Feedback loops feed themselves |
East and West are diverging
| United States | China | |
|---|---|---|
| Approach | Technology-neutral | Approve algorithms first |
| Timing | Judged after the fact | Reviewed before deployment |
| Focus | Risk controls, disclosure, fraud | State visibility, stability |
| Trade-off | Faster, but higher risk | Safer, but slower |
Four dials to watch as machines take the wheel
| Dial | What it asks |
|---|---|
| Algo share (Volume) | Is the human ever the marginal trader? |
| Big Three (Concentration) | How much of the market do three firms vote? |
| Private in 401(k) (Access) | Does illiquidity reach retail retirement? |
| Agentic incidents (Autonomy) | The first true Level-5 blow-up |
Reference
Glossary and sources
Plain-language glossary
| Term | Meaning |
|---|---|
| Index fund | A fund that owns a whole market rather than picking stocks. |
| Passive investing | Matching a market instead of trying to beat it. |
| Robo-advisor | Software that builds and manages a portfolio for you. |
| Private markets | Investments not traded on public exchanges. |
| ETF | An index fund that trades all day like a share. |
| Expense ratio | The annual fee a fund charges, as a % of assets. |
| Direct indexing | Owning an index's individual stocks for tax and tilt control. |
| Agentic AI | Systems that plan, act and self-correct with little human input. |
The genius of the machine age of investing is that it made owning the whole market almost free. Its danger is that when everyone owns the same thing, run by the same code, a market can forget how to disagree, and a market that cannot disagree is one trade away from a stampede.
The five conclusions to take away
- Cheaper won: passive and near-zero fees are permanent, not cyclical.
- Advice became software: robo and direct indexing commoditised allocation.
- Access is the next fight: private markets are being opened, carefully or recklessly.
- Alpha stays scarce: beta democratised; machine alpha did not.
- Correlation is the new risk: efficiency in the calm, fragility in the crisis.
Sources and further reading
- Morningstar: US Fund Fee Study; active vs passive flows (2023-24).
- Investment Company Institute (ICI): Fact Book, index fund and ETF data.
- ETFGI: global ETF industry assets (2024).
- S&P Dow Jones Indices: SPIVA Scorecard (active vs index).
- Preqin; McKinsey: Global Private Markets Review (2024).
- BlackRock: Aladdin, iShares and ETF market projections.
- SEC, CFTC, FINRA, BIS: market-structure and algorithmic-trading oversight.
- Company disclosures; Statista; Nof1.ai Alpha Arena. Figures marked 'est.' are compilations.
Sources cited
Morningstar · ETFGI · Bloomberg Intelligence · JPMorgan · BlackRock · Vanguard · Statista · Preqin · McKinsey · S&P Dow Jones Indices (SPIVA) · Investment Company Institute · SEC · CFTC · FINRA · BIS · Institutional Investor · Treleaven et al. · Coinbase · Ethereum (ERC-8004) · Nof1.ai Alpha Arena · Journal of Finance · Nobel Committee · Reuters · Company disclosures · ETFGI, Oct 2026 · Morningstar, 2026 US Fund Fee Study · Morningstar Active/Passive Barometer, Aug 2026 · PWL Capital, Apr 2026 · US Department of Labor proposed rule, Mar 2026 · Wealth Management, 2026 · FOW, May 2026 · InvestmentNews, Aug 2026
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Research, not investment advice. Figures as of , from the sources cited.
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These are my own views as of the update shown on this page. They can change without notice, and I have no duty to update them. Past performance does not indicate future results, and any investment can lose money.
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Figures from company filings, public agencies and other third parties are believed to be reliable, but I have not independently verified them and cannot guarantee them. Forecasts and anything marked as an estimate rest on assumptions that may prove wrong.
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